Rocket SCIENCE is easy. Rocket *technology* is hard.
Rocket science is a tube closed at one end, with a supply of two fuels which (spontaneously?) burn when mixed. THAT'S IT!
Rocket technology, on the other hand, is concerned with making sure you don't get too much fuel too quick (explosion) or too slow (rocket doesn't fly), and the controls to make it fly in the right direction, and launch safely etc etc etc.